TEST REVIEW SHEET 2017
Valence Electrons
What is a valence electron?
What group are the following elements in?
Sr _______ Kr _______ Al _______ Ge _______ Mg __________
Determine the number of valence electrons for the following elements
Ca _______ F________ B _______ O ________ Ne__________
Lewis Dot Diagrams
1.
2.
3.
4.
Determine the element symbol
Determine the group number and the number of valence electrons
Write the symbol
Draw the valence electrons around the symbol using dots to represent
them
Rule #1. No side can
have more than two dots
because each part of the
orvbital can only hold two
electrons.
Rule #2. When filling the
sides of the element
symbol each side gets one
dot before doubling up.
Exceptions are hydrogen
and heliem.

Draw Lewis Dot Structures for the following elements
Lithium
Nitrogen
Polonium
Chlorine
What is the octet rule for chemical bonding?
Ionic Bonds and Ionization Numbers
What types of elements bond together ionically?
What is an ion?
NOTE: If an element has <4 valence electrons it will give them away during an
ionic bond and become a positive ion. If >4, it will take them and become a
negative ion
For the most part…. metals will give away their valence electrons and nonmetals will take enough valence electrons to fill their outer shell.
Determine the ionization number for the following elements
Na _______ Li ______ B_______ N _______ F _________
DETERMINE THE COMPOUND THAT WILL FORM. Use arrows to show the
transfer of electrons for 1 and 2. This can be done on a separate page.
1. Aluminum Oxide
2. Magnesium Chloride
3. Sodium Nitride
4. Lithium Phosphide
Fill in the Chart: (remember: positive ions keep their element name, for
negative ions the ending changes to –ide)
Covalent Bonds
What types of elements bond covalently?
What happens to the valence electrons during a covalent bond?
Diagram a covalent bond of water (H2O)
Write ionic or covalent on the line to define what type of compound forms
when the elements combine.
Ca and O _____________
N and Cl _____________ Li and P ___________
RULES FOR NAMING COVALENT COMPOUNDS
1. Prefixes are added to show the number of atoms.
Fill in the table with the correct number.
mono ____di ______tri______ tetra_____ penta_____
2. The most non-metallic element has the “ide” suffix. Determine which
element has the suffix? * Across a period the elements become
(more/ less) non-metallic.
Sulfur and chlorine _____________________
Carbon and fluorine ______________________
* Down a group the element become (more/ less) metallic. eg.
Chlorine and fluorine ____________________
Carbon and silicon ______________________
3. There is no mono for the first name, ONLY for the second. eg. Carbon
monoxide and is not monocarbon monoxide
4. Where the suffix ends in an “a” or an “o” and the element begins with
an “a” or an “o”, the final vowel of the prefix is often dropped for ease of
pronunciation. eg. Carbon monoxide and not carbon monooxide eg.
dinitrogen tetroxide and not dinitrogen tetraoxide Note: Phosphorous
triiodide remains unchanged.
Sulfur tetraiodide remains unchanged.
Write the name of the following compounds:
1.LiF _________________________________________
2. LiCl _______________________________________
3. Li3P ______________________________________
4. BeBr2 _______________________________________
5. BeI2 ________________________________________
6. BCl3 _________________________________________
7. SiO2 __________________________________________
3. SO3 __________________________________________
4. N2O3 _________________________________________
6. Cl2O4 _________________________________________
7. CO___________________________________________
Write the molecular formula
Dinitrogen pentoxide _______________________________
Disulfur trichloride _________________________________
Tricarbon disufide _________________________________